Tubes are strong and durable. Sizes 0 through 5 (5/64", 3/32", 1/8", 9/64", 5/32" and 11/64"). Each set includes six interchangeable tempered steel tubes and forged steel handle. (Additional replacement tubes #3798-00, -10, -11, -12, -13, -14, -15 and -16.) Use #3461 Protecto Board or #3464 Poly Cutting Board as a base to punch into. This will help protect your tools and your table top.